Positive Pregnancy Test

We lost our baby boy at 5 months due to an insufficient cervix - October 10. We got the go ahead two weeks after to try again. I started ovulation tests to see when I would ovulate primarily to see if things were normalizing. I got a peak on November 15 and we took advantage of the window. I’m 15 DPO have a positive pregnancy test! Have taken one each day for the last 3 days... is this possible?! I took a couple pregnancy tests during ovulation tracking to make sure my hcg went back down and they came back negative. Anyone else experience similar? Made an appt for Dec 10 with my doctor.